I'm an Ubuntu newbie and I'm using it for the first time. During the installation I chose install Ubuntu over Windows, thinking that this will keep the partitions and install Ubuntu on the partition where the Windows was installed (C:) and keep the other one (D:) with all the files on it. After I installed I couldn't find the D:\ partition. Was It formatted as well, and if yes is there some way to retrieve it? Please help I'm desperate, I had some really important files on that partition!
I am a newbie also, so take this answer with a grain of salt. Check your directory and see if you have a /Home directory. This might be where you important files will be found.